1. Department of Chemical Pathology, National Health Laboratory Service
2. Division of Endocrinology, Department of Medicine, Faculty of Health Sciences, University of Stellenbosch, Tygerberg
3. Department of Medicine University of the Witwatersrand Medical School,Johannesburg
4. University of Pretoria and Waterfall City Hospital, Johannesburg
5. Department of Haematology and Molecular Medicine, National Health Laboratory Service